Nice SG! I like modding (some of) my guitars and basses, and have had good experiences with Seymour Duncans. Everyone should have a P90-equipped guitar in their arsenal - the tone, especially for crunchy, biting bluesy rock and huge surf/rockabilly cleans - is unique and full of character. What value pots and caps did you use?
500k cts pots, .022 μF for the bridge cap and .015 μF for the neck cap. modding is highly enjoyable and i like the idea of personal customization. i seriously wish i could afford a vintage guitar (jazzmaster or jag) though.
agreed about the tone, nothing like going straight into an amp and cranking the volume to max with a p90 equipped guitar.